capture timestamped audio (ros ticket #19)

[ahendrix]

I have added a new node (and msg) that enables the ability to capture timestamped audio (in raw). This would be useful for precisely determining when captured sounds happen, such as the click from an SLR camera, and then they can be synchronised with other sensors.

Here is a patch in case this can be added to the project.

trac data:

• Owner: ahendrix
• Reporter: mikebosse
• Reported at: Mon Oct 29 20:34:46 2012
• URL: https://kforge.ros.org/audiocommon/trac//ticket/19

[mikeferguson]

Duplicate of #20